Microstructure and wear resistance of Fe-Cr-C-Mo-V-Ti-N hardfacing layers

TL;DR

This study develops Fe-Cr-C-Mo-V-Ti-N hardfacing coatings via SMAW to enhance wear resistance of components, analyzing microstructure and phase composition, and demonstrating improved wear performance through experimental testing.

Contribution

It introduces a new hardfacing coating with nitrides and evaluates its microstructure and wear resistance, which is a novel approach for improving component durability.

Findings

Hardfacing coatings with nitrides show higher wear resistance.

Microstructure analysis confirms the presence of nitrides and phases.

Wear tests demonstrate significant improvement over non-nitride coatings.

Abstract

In this paper, to improve wear resistance of components such as screws under severe friction-wear, Fe-Cr-C-Mo-V-Ti-N hardfacing coatings were further developed. The hardfacing coatings were acquired by shielded manual arc welding (SMAW) method. The ferroalloys added into the coating flux of the hardfaced electrode were jointly nitrided. The microstructure of the coatings was carried out using X-ray diffraction(XRD), optical microscope(OM), field emission scanning electron microscope (FESEM) and energy dispersive Xray spectrometry (EDS). In addition, FactSage 7.0 software was employed to calculate the equilibrium phase diagram of the hardfacings. The wear resistance was performed on a pin-on-disc machine. The Fe-Cr-C- Mo-V-Ti-N hardfacings exhibited higher wear resistance than cladding layer without nitrides.